Skip to content
Uzi Tools
Back to All Tools
9 Tools Available

Free Health & Fitness Calculators & Tools

Free health calculators for BMI, BMR, TDEE, body fat, calories, water, sleep, ideal weight, and pregnancy planning. Browser-based and free to use.

BMI Calculator

Calculate Body Mass Index from height and weight and see the adult reference category.

Use tool

BMR & TDEE Calculator

Estimate basal metabolic rate, total daily energy expenditure, and activity-adjusted calorie needs.

Use tool

Body Fat Percentage Calculator

Estimate body fat percentage from height, waist, neck, and hip measurements using the US Navy method.

Use tool

Daily Calorie Calculator

Estimate calorie targets for maintenance, weight loss, or weight gain from body metrics and activity.

Use tool

Water Intake Calculator

Estimate daily fluid needs from body weight and activity level, with results in liters and cups.

Use tool

Sleep Cycle Calculator

Calculate suggested bedtimes or wake times from 90-minute sleep cycles and sleep-onset time.

Use tool

Ideal Body Weight Calculator

Estimate ideal body weight from height using the Devine formula, with results in kilograms and pounds.

Use tool

Pregnancy Due Date Calculator

Estimate a pregnancy due date from the first day of your last menstrual period (LMP).

Use tool

Ovulation Calculator

Estimate ovulation and the fertile window from your last period and average cycle length.

Use tool

Use health calculators as starting estimates

These tools apply common formulas to the measurements you enter. They can help you understand a number or prepare a question, but they cannot account for every aspect of a person's health.

Health results are informational estimates, not a diagnosis or treatment plan. Speak with a healthcare professional when your situation is personal, urgent, or medically complex.

Frequently Asked Questions